73,246
students have developed their C++ skills on Exercism.

Students
73,246
Submissions
468,861
Mentoring Discussions
10,457

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Build Test Runners

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Create Test Runners that have the single responsibility of taking a solution, running all tests and returning a standardized output.

Usage statistics

Total Test Runner Runs
420,156
Test Run Pass Rate
18.6% (78031)
Test Run Fail Rate
17.5% (73453)
Test Run Error Rate
63.9% (268672)

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Build an Analyzer for C++: Exercism's analyzers automatically assess student's submissions and provide mentor-style commentary.

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Build a Representer: a bit of code that has the single responsibility of taking a solution and returning a normalized representation of it.

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Create Practice Exercises

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Practice Exercises are exercises designed to allow students to solve an arbitrary problem, with the aim of them making use of the concepts they have learned so far.

Next goal: Implement 132 practice exercises. Find out more.

Usage statistics

59 active practice exercises
Started
Attempts
Completions
Mentoring requests
Hello World Hello World
42,838
111,575 (avg. 2.6)
22,348 (52.2%)
12 (0.0%)
Leap Leap
16,184
61,485 (avg. 3.8)
7,884 (48.7%)
2,415 (14.9%)
Reverse String Reverse String
8,485
50,675 (avg. 6.0)
4,995 (58.9%)
1,409 (16.6%)
Space Age Space Age
4,811
34,886 (avg. 7.3)
2,584 (53.7%)
1,057 (22.0%)
Triangle Triangle
3,214
21,911 (avg. 6.8)
1,999 (62.2%)
722 (22.5%)
Grains Grains
2,251
13,550 (avg. 6.0)
1,808 (80.3%)
573 (25.5%)
Raindrops Raindrops
1,893
7,179 (avg. 3.8)
1,649 (87.1%)
479 (25.3%)
Pangram Pangram
1,695
11,097 (avg. 6.5)
1,358 (80.1%)
447 (26.4%)
Two Fer Two Fer
1,641
6,317 (avg. 3.8)
1,346 (82.0%)
74 (4.5%)
Grade School Grade School
2,041
13,988 (avg. 6.9)
1,337 (65.5%)
194 (9.5%)
Hamming Hamming
3,683
8,273 (avg. 2.2)
2,949 (80.1%)
346 (9.4%)
Nucleotide Count Nucleotide Count
2,288
10,868 (avg. 4.8)
1,603 (70.1%)
261 (11.4%)
RNA Transcription RNA Transcription
1,563
6,039 (avg. 3.9)
1,283 (82.1%)
154 (9.9%)
Collatz Conjecture Collatz Conjecture
1,075
4,553 (avg. 4.2)
890 (82.8%)
43 (4.0%)
Difference of Squares Difference of Squares
1,891
4,038 (avg. 2.1)
1,575 (83.3%)
154 (8.1%)
Nth Prime Nth Prime
1,253
6,800 (avg. 5.4)
820 (65.4%)
107 (8.5%)
Queen Attack Queen Attack
1,072
6,526 (avg. 6.1)
697 (65.0%)
85 (7.9%)
Sieve Sieve
989
3,464 (avg. 3.5)
737 (74.5%)
100 (10.1%)
Say Say
1,005
6,037 (avg. 6.0)
528 (52.5%)
96 (9.6%)
Gigasecond Gigasecond
2,280
3,542 (avg. 1.6)
1,522 (66.8%)
250 (11.0%)
Secret Handshake Secret Handshake
602
2,536 (avg. 4.2)
470 (78.1%)
27 (4.5%)
Allergies Allergies
750
3,079 (avg. 4.1)
536 (71.5%)
39 (5.2%)
Protein Translation Protein Translation
565
2,512 (avg. 4.4)
443 (78.4%)
30 (5.3%)
Sum of Multiples Sum of Multiples
1,044
2,990 (avg. 2.9)
793 (76.0%)
64 (6.1%)
Prime Factors Prime Factors
759
1,887 (avg. 2.5)
571 (75.2%)
41 (5.4%)
Robot Name Robot Name
995
3,978 (avg. 4.0)
680 (68.3%)
91 (9.1%)
Clock Clock
648
1,750 (avg. 2.7)
364 (56.2%)
37 (5.7%)
Meetup Meetup
541
773 (avg. 1.4)
287 (53.0%)
19 (3.5%)
Beer Song Beer Song
580
2,359 (avg. 4.1)
431 (74.3%)
31 (5.3%)
Atbash Cipher Atbash Cipher
551
3,367 (avg. 6.1)
398 (72.2%)
24 (4.4%)
Trinary Trinary
646
1,853 (avg. 2.9)
540 (83.6%)
18 (2.8%)
Binary Search Binary Search
551
2,495 (avg. 4.5)
368 (66.8%)
28 (5.1%)
Phone Number Phone Number
706
1,950 (avg. 2.8)
505 (71.5%)
34 (4.8%)
Series Series
453
1,616 (avg. 3.6)
335 (74.0%)
16 (3.5%)
Complex Numbers Complex Numbers
527
2,021 (avg. 3.8)
343 (65.1%)
14 (2.7%)
Food Chain Food Chain
696
1,061 (avg. 1.5)
493 (70.8%)
25 (3.6%)
Roman Numerals Roman Numerals
508
1,425 (avg. 2.8)
362 (71.3%)
16 (3.1%)
Bob Bob
1,937
3,894 (avg. 2.0)
1,613 (83.3%)
231 (11.9%)
Word Count Word Count
1,100
2,556 (avg. 2.3)
846 (76.9%)
82 (7.5%)
Circular Buffer Circular Buffer
429
2,144 (avg. 5.0)
242 (56.4%)
30 (7.0%)
Crypto Square Crypto Square
433
1,712 (avg. 4.0)
278 (64.2%)
12 (2.8%)
ETL ETL
1,018
1,710 (avg. 1.7)
828 (81.3%)
37 (3.6%)
Matching Brackets Matching Brackets
524
1,920 (avg. 3.7)
380 (72.5%)
24 (4.6%)
Anagram Anagram
1,262
2,437 (avg. 1.9)
988 (78.3%)
86 (6.8%)
Binary Search Tree Binary Search Tree
628
1,880 (avg. 3.0)
175 (27.9%)
27 (4.3%)
Luhn Luhn
479
2,385 (avg. 5.0)
347 (72.4%)
27 (5.6%)
Acronym Acronym
547
1,576 (avg. 2.9)
397 (72.6%)
25 (4.6%)
Armstrong Numbers Armstrong Numbers
532
1,560 (avg. 2.9)
417 (78.4%)
20 (3.8%)
Binary Binary
811
2,159 (avg. 2.7)
627 (77.3%)
76 (9.4%)
Hexadecimal Hexadecimal
611
1,434 (avg. 2.3)
454 (74.3%)
57 (9.3%)
Isogram Isogram
2,054
2,945 (avg. 1.4)
1,223 (59.5%)
87 (4.2%)
Pascal's Triangle Pascal's Triangle
502
1,272 (avg. 2.5)
371 (73.9%)
20 (4.0%)
Scrabble Score Scrabble Score
852
1,909 (avg. 2.2)
615 (72.2%)
78 (9.2%)
All Your Base All Your Base
489
1,390 (avg. 2.8)
299 (61.1%)
34 (7.0%)
Robot Simulator Robot Simulator
851
2,424 (avg. 2.8)
447 (52.5%)
44 (5.2%)
Bank Account Bank Account
109
296 (avg. 2.7)
38 (34.9%)
9 (8.3%)
Darts Darts
78
229 (avg. 2.9)
54 (69.2%)
3 (3.8%)
Largest Series Product Largest Series Product
47
177 (avg. 3.8)
32 (68.1%)
2 (4.3%)
Isbn Verifier Isbn Verifier
81
397 (avg. 4.9)
56 (69.1%)
2 (2.5%)
73 unimplemented practice exercises
Affine Cipher Affine Cipher
Alphametics Alphametics
Book Store Book Store
Bottle Song Bottle Song
Bowling Bowling
Change Change
Connect Connect
Custom Set Custom Set
D&D Character D&D Character
DOT DSL DOT DSL
Diamond Diamond
Dominoes Dominoes
Error Handling Error Handling
Flatten Array Flatten Array
Forth Forth
Go Counting Go Counting
Grep Grep
Hangman Hangman
High Scores High Scores
House House
Killer Sudoku Helper Killer Sudoku Helper
Kindergarten Garden Kindergarten Garden
Knapsack Knapsack
Ledger Ledger
Lens Person Lens Person
Linked List Linked List
List Ops List Ops
Markdown Markdown
Matrix Matrix
Micro Blog Micro Blog
Minesweeper Minesweeper
OCR Numbers OCR Numbers
POV POV
PaaS I/O PaaS I/O
Palindrome Products Palindrome Products
Parallel Letter Frequency Parallel Letter Frequency
Perfect Numbers Perfect Numbers
Pig Latin Pig Latin
Poker Poker
Proverb Proverb
Pythagorean Triplet Pythagorean Triplet
REST API REST API
Rail Fence Cipher Rail Fence Cipher
Rational Numbers Rational Numbers
React React
Rectangles Rectangles
Resistor Color Resistor Color
Resistor Color Duo Resistor Color Duo
Resistor Color Trio Resistor Color Trio
Rotational Cipher Rotational Cipher
Run-Length Encoding Run-Length Encoding
SGF Parsing SGF Parsing
Saddle Points Saddle Points
Satellite Satellite
Scale Generator Scale Generator
Simple Cipher Simple Cipher
Simple Linked List Simple Linked List
Spiral Matrix Spiral Matrix
Square Root Square Root
State of Tic-Tac-Toe State of Tic-Tac-Toe
Strain Strain
Sublist Sublist
Tournament Tournament
Transpose Transpose
Tree Building Tree Building
Twelve Days Twelve Days
Two Bucket Two Bucket
Variable Length Quantity Variable Length Quantity
Word Search Word Search
Wordy Wordy
Yacht Yacht
Zebra Puzzle Zebra Puzzle
Zipper Zipper
1 foregone practice exercise
Point Mutations Point Mutations